Chinese and Australian scientists are using nanotechnology for something that really matters: cleaning clothes. We suspect they will easily win the Nobel Peace Prize for this one.
They accomplish this by coating clothing with a titanium-oxide based compound, which breaks down dirt and stains when exposed to sunlight. The garment can then be easily cleaned without needing soap and water.
This will be a welcome innovation when the world runs out of water, but we need to keep our socks clean. Currently, the compound will only bond to silk or wool, so step aside cotton.